JP5766473B2 - Fixed leg structure and fixed leg structure of electrical junction box - Google Patents

Description

  The present invention relates to a resin component fixed leg structure and a resin component fixed leg structure constituting an electrical junction box.

  An electric connection box is widely known as a device that is mounted on a vehicle such as an automobile and distributes power, for example. The electrical junction box is known as a generic term for a relay box, a fuse box, a junction block, an electronic control unit box, or the like.

  The electric junction box has a resin casing, and is fixed by bolting a fixing leg extending from a side portion of the casing to a panel member or a body of the vehicle. The housing includes a main body frame, an upper cover that overlaps the upper side of the main body frame, and a lower cover that overlaps the lower side of the main body frame. Alternatively, the upper cover and the lower cover overlap each other. The fixed leg is formed in a leg shape protruding from the side portion of the lower cover (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 2005-39879

  The fixed leg is provided to fix the electrical junction box at a predetermined fixed position of a fixed counterpart, but has the following problems with respect to the fixed leg. Hereinafter, description will be given with reference to the drawings. FIG. 6 shows a general fixed leg.

  In FIG. 6, the fixed leg 1 is provided in the side part of the resin-made lower covers, for example. The fixed leg 1 has a fixed leg main body part 2 and a bolt fixing part 3. One end of the fixed leg main body portion 2 is coupled to the side portion. A bolt fixing portion 3 is coupled to the other end of the fixed leg main body portion 2. Such a fixed leg 1 has a shape like a lump of resin when viewed from the surface side as shown in FIG. However, if the resin is molded in a lump shape that is sufficiently thicker than the thickness of the side portion, so-called “sinking” occurs, so as shown in FIG. It is common to be resin-molded into a punched shape.

  Explaining the above-described thinning shape of the fixed leg 1, the fixed leg main body 2 includes an upper wall 4 and side walls 5 extending downward from both sides of the upper wall 4, as shown in FIGS. 6 (a) and 6 (b). have. On the back surface of the upper wall 4, three vertical ribs 6 are formed at equal intervals between the side walls 5, 5 along the direction in which the fixed leg main body 2 extends. Further, on the back surface of the upper wall 4, one lateral rib 7 that connects the side walls 5, 5 and the three vertical ribs 6 is formed. The upper wall 4, the side wall 5, the vertical rib 6 and the horizontal rib 7 are formed in a thin plate shape having the same thickness.

  The thinning shape of the bolt fixing portion 3 is the same as that of the above-described fixed leg main body portion 2, and as shown in FIGS. 6 (b) and 6 (c), the substantially circular upper wall 8 and the peripheral edge of the upper wall 8. And a peripheral side wall 9 extending downward. A through hole 10 is formed at the center of the upper wall 8 as a portion for inserting a fixing bolt (not shown). A circular rib 11 is formed on the back surface of the upper wall 8 as a portion that deepens the through hole 10. Further, on the back surface of the upper wall 8, radial ribs 12 extending radially from the circular ribs 11 at a 90 ° pitch and continuing to the peripheral side wall 9 are formed. The upper wall 8, the peripheral side wall 9, the circular rib 11 and the radiation rib 12 are formed in a thin plate shape having the same thickness.

  The fixed leg 1 is formed in a hollow shape that can ensure the necessary minimum strength. Therefore, there is a problem that damage occurs when an unexpected excessive external force is applied. Further, there is a problem that the bolt fixing portion 3 is buckled when it is excessively tightened with a bolt (not shown).

  This invention is made | formed in view of an above-described situation, and makes it a subject to provide the fixed leg structure which can aim at strength improvement, and the fixed leg structure of an electrical-connection box.

The fixed leg structure of the present invention according to claim 1, which has been made to solve the above-mentioned problems, is provided with fixing legs on at least two of the resin parts of two or more resin parts to be overlapped, legs, said resin component same position or another position with respect to the direction overlay come together in the resin component, the fixed legs of their respective a fixed leg body portion extending toward a predetermined fixing position of the fixing destination When, and a bolt fixing portion continuous to said stationary leg body portion, of each of the bolt fixing portion even without least, on one of the bolt fixing part, lightening portion in which the superposition uneven direction is formed Each of the bolt fixing portions is provided with a lightening portion formed with concavities and convexities opposite to the concavities and convexities of the one bolt fixing portion, and the bolt fixing portions are overlapped with each other. in the leg And characterized by being formed so that to have a rigidity.

  The fixed leg structure according to a second aspect of the present invention is characterized in that in the fixed leg structure according to the first aspect, each of the bolt fixing portions has an engagement uneven portion that is uneven in the overlapping direction. To do.

Fixing leg assemblies of the present invention according to claim 3, in the fixed leg structure according to claim 2, wherein the engaging uneven portion is characterized in that also serves the lightening portion of the resin molding.

According to a fourth aspect of the present invention, there is provided a fixing leg structure for an electric junction box according to the present invention, wherein a frame side fixing leg is provided on a main body frame constituting a resin casing of the electric junction box. A cover side fixing leg is provided on a lower cover that constitutes a resin casing and overlaps the main body frame, and the frame side fixing leg and the cover side fixing leg are located at the same position or different from each other in the overlapping direction of the main body frame and the lower cover. position come together in the body frame and the lower cover, front SL frame side fixing legs and the cover-side fixing leg includes a fixed leg body portion extending respectively toward a predetermined fixing position of the fixing destination, to the fixed leg body portion of and a continuous bolt fixing portion, of each of the bolt fixing portion even without least, on one of the bolt fixing part, the superimposed irregularities direction forming The lightening portion is provided with, on the other bolt fixing portion, a lightening portion opposite unevenness formed provided with irregularities of the bolt fixing portion of the one, by superimposing each of the bolt fixing portions, wherein the frame-side fixing legs and the cover-side fixing legs, and characterized by being formed so that to have a rigidity.

  According to the first aspect of the present invention, the fixed leg is provided as a fixed part with the fixed counterpart, and at least two of the fixed legs are provided for each predetermined fixed position of the fixed counterpart. Since the fixed leg is formed so as to have a shape in which at least the bolt fixing portions of the fixed leg overlap each other, it is possible to naturally increase the thickness of the fixed leg as compared with the case of one. Therefore, the strength can be significantly improved as compared with the conventional fixed leg. In addition, according to the present invention, since fixing is performed with at least two fixing legs, there is also an effect that it is possible to suppress backlash between the resin parts to be overlapped. Further, according to the present invention, since the fixing legs are provided at the same position or different positions with respect to the overlapping direction of the resin parts, the strength can be improved without being influenced by the position where the fixing legs are integrated with the resin parts. There is also an effect that can be done.

  According to the second aspect of the present invention, since the engaging uneven portion is provided in the bolt fixing portion, the engaging uneven portion can be engaged with each other as the bolt fixing portions are overlapped with each other. As a result, the thickness can be increased by the amount of the engaging uneven portion, and it is possible to prevent positioning and prevent rotation when bolting.

  According to the third aspect of the present invention, since the engaging uneven portion is also used as a thinned portion in resin molding, there is an effect that “sinking” can be prevented and stable fixing can be achieved.

  According to the fourth aspect of the present invention, there is an effect that it is possible to provide a better fixed leg structure employed in the electrical junction box.

It is a figure of the electrical junction box which employ | adopts the fixed leg structure of this invention, (a) is a front view, (b) is a top view (Example 1). It is a figure of the electrical junction box of FIG. 1, (a) is a perspective view, (b) is a disassembled perspective view. It is a figure which concerns on the fixed leg of FIG.1 and FIG.2, (a) is a rear view, (b) is the sectional view on the AA line of (a). It is a figure which concerns on the other example of the electrical junction box which employ | adopts the fixed leg structure of this invention, (a) is a perspective view, (b) is a disassembled perspective view (Example 2). It is a figure which concerns on the fixed leg of FIG. 4, (a) is a rear view, (b) is a rear view of the state which partially fractured | ruptured the front-end | tip part of the cover side fixed leg , (c) is BB of (a). It is line sectional drawing. It is a figure which concerns on the fixed leg structure of a prior art example, (a) is a perspective view, (b) is a rear view, (c) is CC sectional view taken on the line of (b).

  The fixed leg structure is a structure in which a fixing leg is provided on a resin component, and a fixing leg is also provided on another resin component that overlaps the resin component to fix the resin component. The fixed leg is formed so that at least the respective bolt fixing portions overlap each other. Each bolt fixing part has an engaging uneven part which becomes uneven in the overlapping direction of these. The engaging uneven portion also serves as a lightening portion in resin molding.

  Embodiment 1 will be described below with reference to the drawings. FIG. 1 is a diagram of an electrical junction box that employs the fixed leg structure of the present invention, where (a) is a front view and (b) is a plan view. 2 is a diagram of the electrical junction box of FIG. 1, wherein (a) is a perspective view and (b) is an exploded perspective view. 3 is a view related to the fixed leg of FIGS. 1 and 2, wherein (a) is a rear view and (b) is a cross-sectional view taken along line AA of (a).

  In the following description, specific shapes, materials, numerical values, directions, and the like are examples for facilitating the understanding of the present invention, and can be appropriately changed according to use, purpose, specifications, and the like. To do.

  1 and 2, reference numeral 21 indicates an electrical junction box. The electrical connection box 21 is a generic term for a relay box, a fuse box, a junction block, an electronic control unit box, or the like, and is mounted on a vehicle such as an automobile. The electric connection box 21 is fastened and fixed to a fixing counterpart 22 such as a vehicle panel member or body by a bolt 23. The fixed portion employs the fixed leg structure of the present invention.

  The electrical connection box 21 includes a resin casing 24 (resin casing). The casing 24 is provided as a member for housing a functional part (not shown) including an electrical / electronic component, a connector connecting portion, a circuit, and the like. In the present embodiment, the casing 24 includes a main body frame 25, an upper cover 26 that overlaps the upper side of the main body frame 25, and a lower cover 27 that overlaps the lower side of the main body frame 25. The main body frame 25, the upper cover 26, and the lower cover 27 are provided as resin parts to be overlaid. An arrow P indicates the overlapping direction (the overlapping direction and the vertical direction).

  The housing 24 is configured such that the main body frame 25 and the upper cover 26 are fitted to each other by a known lock structure. The main body frame 25 and the lower cover 27 are also fitted together by a known lock structure. The fitting portion is formed in a watertight state by a known waterproof structure.

  The main body frame 25 has a frame side fixed leg 28 (fixed leg) that adopts the fixed leg structure of the present invention. The lower cover 27 also has a cover-side fixed leg 29 (fixed leg) that employs the fixed leg structure of the present invention. The frame-side fixing leg 28 and the cover-side fixing leg 29 have shapes that at least partially overlap each other (see Example 2 for the entire overlap). The frame-side fixed leg 28 and the cover-side fixed leg 29 are formed as fixed portions having a substantially leg shape.

  In the present embodiment, as a fixed portion with respect to the fixed counterpart 22, one location by the frame side fixed leg 28 and the cover side fixed leg 29 is mentioned, but the fixed location is not limited to this one location. For example, when a plurality of fixing points are provided, the frame side fixing leg 28 and the cover side fixing leg 29 are adopted for each fixing point.

  First, the frame side fixed leg 28 will be described. 1 to 3, the frame-side fixing leg 28 is provided on the side portion 30 of the main body frame 25. The base end portion of the frame-side fixing leg 28 is disposed on the side portion 30 at, for example, a position Q (see FIG. 1). Further, the distal end portion of the frame side fixing leg 28 is disposed at a position corresponding to a predetermined fixing position R (see FIG. 1) of the fixing counterpart 22. Such a frame side fixed leg 28 has the fixed leg main-body part 31 containing the said base end part, and the volt | bolt fixing | fixed part 32 used as the said front-end | tip part.

  The fixed leg main body 31 has one end serving as the base end portion connected to the side portion 30. A bolt fixing portion 32 is coupled to the other end. The fixed leg main body 31 is formed to extend toward a predetermined fixed position R (see FIG. 1) of the fixed counterpart 22. The fixed leg main body 31 is formed in a shape extending obliquely downward from the vicinity of the base end portion (assumed as an example).

  The fixed leg main body 31 has an upper wall 33 and side walls 34 extending downward from both sides of the upper wall 33. On the back surface of the upper wall 33, vertical ribs 35 are formed along the direction in which the fixed leg main body 31 extends. The longitudinal rib 35 is formed at the center position between the side walls 34. Further, on the back surface of the upper wall 33, lateral ribs (not shown; the lateral rib 55 in FIG. 5 serves as a reference) connecting the side walls 34 and 34 and the longitudinal ribs 35 are formed. The upper wall 33, the side wall 34, the vertical rib 35, and the horizontal rib are formed in a thin plate shape having the same thickness.

  The fixed leg main-body part 31 is formed in the shape which has the thinning part in resin molding. That is, the fixed leg main body 31 is formed in a shape that makes it difficult for “sink marks” to occur. The fixed leg main-body part 31 is formed in the shape which is not a lump of resin.

  A relief portion 36 is formed in a continuous portion of the fixed leg main body portion 31 and the bolt fixing portion 32 in consideration of the tightening operation of the bolt 23.

  The bolt fixing portion 32 has a substantially circular upper wall 37 and a peripheral side wall 38 extending downward from the periphery of the upper wall 37. A through hole 39 for inserting the fixing bolt 23 is formed at the center of the upper wall 37. A circular rib 40 is formed on the back surface of the upper wall 37 as a portion that deepens the through hole 39. Further, on the back surface of the upper wall 37, there are formed radiating ribs 41 extending radially from the circular ribs 40 at a pitch of 90 degrees and continuing to the peripheral side wall 38. The upper wall 37, the peripheral side wall 38, the circular rib 40, and the radiation rib 41 are formed to have the same thickness.

  The back surface of the upper wall 37 is formed in a shape that is uneven by the peripheral side wall 38, the circular rib 40, and the radiation rib 41. That is, it is formed in a shape that becomes the engagement uneven portion 42. The engaging uneven portion 42 is formed in a shape that becomes uneven in the overlapping direction P.

  The bolt fixing portion 32 is formed in a shape having a lightening portion in resin molding, similar to the fixed leg main body portion 31. That is, the bolt fixing portion 32 is formed in a shape that makes it difficult for “sink marks” to occur. The bolt fixing portion 32 is formed in a shape that is not a lump of resin.

  Next, the cover side fixing leg 29 of the lower cover 27 will be described. The cover side fixing leg 29 is provided on the side portion 43 of the lower cover 27. The base end portion of the cover-side fixing leg 29 is disposed at, for example, a position S (see FIG. 1) in the side portion 43. Further, the distal end portion of the cover-side fixing leg 29 is disposed at a position corresponding to a predetermined fixing position R (see FIG. 1) of the fixing counterpart 22. Such a cover-side fixing leg 29 has a fixing leg main body portion 44 including the base end portion and a bolt fixing portion 45 serving as the tip end portion.

  The fixed leg main body 44 has one end serving as the base end portion connected to the side portion 43. A bolt fixing portion 45 is coupled to the other end. The fixed leg main body 44 is formed to extend toward a predetermined fixed position R (see FIG. 1) of the fixed counterpart 22. The fixed leg main body 44 is formed in a shape extending obliquely downward from the vicinity of the base end portion.

  The fixed leg main body 44 includes an upper wall 46 and side walls 47 extending downward from both sides of the upper wall 46. On the back surface of the upper wall 46, vertical ribs 48 are formed along the direction in which the fixed leg main body 44 extends. The vertical rib 48 is formed at the center position between the side walls 47 and 47. Further, on the back surface of the upper wall 46, lateral ribs (not shown; the lateral ribs 56 in FIG. 5 serve as a reference) connecting the side walls 47, 47 and the longitudinal ribs 48 are formed. The upper wall 46, the side wall 47, the vertical rib 48, and the horizontal rib are formed in a thin plate shape having the same thickness.

  The fixed leg main body 44 is formed in a shape having a lightening portion in resin molding. In other words, the fixed leg main body 44 is formed in a shape that makes it difficult for “sink marks” to occur. The fixed leg main body 44 is formed in a shape that is not a lump of resin.

  A stepped portion 49 for the bolt fixing portion 32 is formed at a continuous portion of the fixed leg main body portion 44 and the bolt fixing portion 45.

  The bolt fixing portion 45 has a substantially circular lower wall 50. A through hole 51 for inserting the fixing bolt 23 is formed at the center of the lower wall 50. On the surface of the lower wall 50, an engaging uneven portion 52 is formed as a portion that engages with the peripheral side wall 38, the circular rib 40, and the radiation rib 41 of the bolt fixing portion 32, that is, a portion that engages with the engaging uneven portion 42. Has been. The engaging uneven portion 52 includes an engaging rib 53 having a convex surface on the lower wall 50 and a concave surface on the back surface, and an engaging groove 54 formed in a concave shape between the adjacent engaging ribs 53. ing. The lower wall 50 and the engagement uneven portion 52 are formed to be thin with the same thickness.

  The engaging uneven portion 52 is formed in a shape that becomes uneven in the overlapping direction P. The bolt fixing portion 45 is formed in a shape having a lightening portion in resin molding, like the fixed leg main body portion 44. That is, the bolt fixing portion 45 is formed in a shape that makes it difficult for “sink marks” to occur. The bolt fixing portion 45 is formed in a shape that is not a lump of resin.

  In the above configuration and structure, the fixed leg structure of the present invention is configured such that when the lower cover 27 is overlapped from the lower side of the main body frame 25, the bolt fixing portion 32 on the frame side fixing leg 28 of the main body frame 25 and the cover side fixing of the lower cover 27. The bolt fixing part 45 in the leg 29 overlaps. At this time, the engagement uneven portion 42 of the bolt fixing portion 32 and the engagement uneven portion 52 of the bolt fixing portion 45 are engaged. When the engaging uneven portion 42 and the engaging uneven portion 52 are engaged, this engaging portion becomes a thick portion as shown in FIG. 3B, so even if excessive tightening and fixing are performed. There is no buckling. Since the fixed leg structure of the present invention is a structure in which the wall thickness is increased as compared with the conventional structure, the strength can be improved.

  In the fixed leg structure of the present invention, the frame side fixed leg 28 of the main body frame 25 and the cover side fixed leg 29 of the lower cover 27 are provided with rigidity. Since the two fixing legs 29 are used for fixing, the strength can be remarkably improved as compared with the case of one fixing leg.

  In addition, since the fixed leg structure of the present invention is fixed by two of the frame side fixed leg 28 and the cover side fixed leg 29, it is possible to suppress backlash between the main body frame 25 and the lower cover 27 to be overlapped. . In the fixed leg structure of the present invention, the frame side fixed leg 28 and the cover side fixed leg 29 are provided at the positions Q and S which are different positions when viewed in the overlapping direction P. Even if it is not integrated, the strength can be improved.

  In the above embodiment, the frame side fixing leg 28 and the cover side fixing leg 29 are described. However, a third fixing leg may be provided on the upper cover 26 to further improve the strength. Shall. Moreover, in the said Example, although the engagement uneven | corrugated part 42 and the engagement uneven | corrugated part 52 were provided in the bolt fixing | fixed part 32 and the bolt fixing | fixed part 45, the same uneven | corrugated engaging part is fixed to the fixed leg main-body part 31 and fixed. The leg main body 44 may be provided. Further, in the above embodiment, the cover side fixing leg 29 of the lower cover 27 is coupled to the side portion 43, but it may be the bottom portion (lower portion) of the lower cover 27 or the like.

  The fixed leg structure of the present invention is not limited to the electrical junction box 21 and can be applied to, for example, a resin protector used for wiring a wire harness.

Embodiment 2 will be described below with reference to the drawings. 4A and 4B are diagrams according to another example of the electrical junction box employing the fixed leg structure of the present invention, in which FIG. 4A is a perspective view and FIG. 4B is an exploded perspective view. 5 is a view related to the fixed leg of FIG. 4, (a) is a rear view, (b) is a rear view in a state where a tip part of the cover side fixed leg is partially broken, and (c) is (a) It is a BB line sectional view of).

  Regarding the reference numerals in the figure, the same reference numerals are used since the same constituent members as in the first embodiment are used.

  4 and 5, the electrical connection box 21 of the second embodiment is different from the first embodiment in the following points. That is, the frame side fixed leg 28 and the cover side fixed leg 29 are different in that they are arranged at the position T. Further, the frame side fixing leg 28 and the cover side fixing leg 29 are different in that the extending direction is a predetermined fixing position U of the fixing counterpart 22. Furthermore, the frame-side fixing leg 28 and the cover-side fixing leg 29 are all formed in a shape that overlaps vertically.

  The electrical junction box 21 of Example 2 has the same effect as the electrical junction box 21 of Example 1.

  In addition, the present invention can of course be modified in various ways within the scope not changing the gist of the present invention.

21 ... Electrical junction box 22 ... Fixed counterpart 23 ... Bolt 24 ... Housing (resin housing)
25 ... Body frame (resin parts)
26 ... Upper cover (resin parts)
27 ... Lower cover (resin parts)
28 ... Fixed legs (fixed legs)
29 ... Cover side fixed leg (fixed leg)
DESCRIPTION OF SYMBOLS 30 ... Side part 31 ... Fixed leg main-body part 32 ... Bolt fixing part 33 ... Upper wall 34 ... Side wall 35 ... Vertical rib 36 ... Relief part 37 ... Upper wall 38 ... Peripheral side wall 39 ... Through-hole 40 ... Circular rib 41 ... Radiation rib 42 ... engagement uneven part 43 ... side part 44 ... fixed leg main body part 45 ... bolt fixing part 46 ... upper wall 47 ... side wall 48 ... vertical rib 49 ... step part 50 ... lower wall 51 ... through hole 52 ... engagement uneven part 53 ... engaging rib 54 ... engaging groove 55, 56 ... lateral rib

Claims (4)

At least two of the resin parts to be overlapped with two or more are provided with fixing legs, and each of the fixing legs is attached to the resin parts at the same position or different position with respect to the overlapping direction of the resin parts. United ,
The fixed legs of their respective has a fixed leg body portion extending toward a predetermined fixing position of the fixing destination, and a bolt fixing portion continuous to said stationary leg body part,
Of each of the bolt fixing portion even without least, on one of the bolt fixing part, the superposition direction provided lightening portion which irregularities are formed on the other of the bolt fixing part, unevenness of the bolt fixing portion of the one wherein the lightening portion irregularities are formed opposite arranged, by superimposing each of the bolt fixing portions, that each of the fixed leg, obtained by forming a so that to have a stiffness to the Fixed leg structure. The fixed leg structure according to claim 1,
Each said bolt fixing | fixed part has an engagement uneven | corrugated part which becomes uneven | corrugated in the said superimposition direction. The fixed leg structure characterized by the above-mentioned. The fixed leg structure according to claim 2,
The engaging uneven portion is fixed leg structure, characterized in that also serves the lightening portion of the resin molding. A frame-side fixing leg is provided on a main body frame constituting a resin casing of the electrical junction box, and a cover-side fixing leg is provided on a lower cover that constitutes the resin casing and overlaps the main body frame. The cover side fixed leg is integrated with the main body frame and the lower cover at the same position or different positions with respect to the overlapping direction of the main body frame and the lower cover ,
Before SL frame side fixing legs and the cover-side fixing leg has a fixing leg body portion extending respectively toward a predetermined fixing position of the fixing destination, and a bolt fixing portion continuous to said stationary leg body part,
Of each of the bolt fixing portion even without least, on one of the bolt fixing part, the superposition direction provided lightening portion which irregularities are formed on the other of the bolt fixing part, unevenness of the bolt fixing portion of the one the lightening portions which irregularities are formed opposite provided with, by superimposing each of the bolt fixing portions, the frame-side fixing legs and the cover-side fixing leg, formed so that to have a stiffness Stabilizer structure of an electrical connection box, characterized in that formed by.

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